IL10 and Parkinson disease: There was a positive trend of the correlation between the serum IL-10 concentrations and the number of cTfr in PD patients (P = 0.047, r = 0.328 Figure 5C), however, we didn't found the correlations between the serum TGF-β concentrations and the number of cTfr in PD patients (P = 0.824, Figure 5D).